Dopamine and serotonin in particular are the neurotransmitters that are relevant when it comes to goals. Dopamine is considered a ‘reward’ chemical that your brain releases when you’ve achieved (or you’re close to achieving) a goal. It creates feelings of motivation, satisfaction and productivity. Serotonin helps to create feelings of happiness, calm and focus. The presence of neurotransmitters explains why you feel great when you achieve a goal.